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Good typers type words that are spelled correctly faster than shortcuts. This is so because they are used to typing spelled out words and will take a while to figure out where the numbers are when they\'re about to type a message with numbers after letters to make words. Also, saying stuff with numbers combined with letters will make other players stop in their tracks, scratch their heads, and attempt to decipher your message.
About the school of Spelling and Grammer.... Like Gronomist said, it only takes someone like you running a school to discipline most newbies, running around saying \"I r kill u plz now n00b!\" But what\'s the chance that the newbies who run into your school don\'t pay any attention to you, or block you? ?( Or do you have a secret plan to prevent that...?